Ferrous fumarate 210mg from Mercury Pharma is often recommended during pregnancy due to its iron content. When comparing iron supplements, ferrous sulfate and bisglycinate are commonly discussed, while ferrous gluconate is recognized as a good source of iron. Additionally, incorporating calcium citrate with vitamin D3 can enhance the absorption of iron and support overall health. It is important for pregnant individuals to consider the benefits of ferrous gluconate, especially when paired with calcium citrate with vitamin D3 to optimize nutrient absorption. Therefore, the combination of ferrous fumarate and calcium citrate with vitamin D3 can be advantageous during pregnancy, ensuring both iron levels and calcium intake are adequately managed for maternal and fetal health.